SharePoint 2010 External Content Type Step by Step (BCS)

http://www.sharepoint-videos.com/sp10create-external-content-types-using-sharepoint-designer-2010/

http://vimeo.com/9509918


http://msdn.microsoft.com/en-us/library/ie/ee557243.aspx

http://www.lightningtools.com/blog/archive/2009/11/17/external-content-type-in-sharepoint-designer-ndash-sql-server.aspx